Kirui, 34, edged 2015 winner Dickson Chumba, who was second in 2:11:26, with Gideon Kipketer third in 2:12:20.

While Chumba was unable to repeat his 2015 triumph, Kenya’s Florence Kiplagat won her second straight Chicago crown, powering to a dominant victory in 2:21:32, almost two seconds ahead of runner-up Edna Kiplagat (2:23:28).